It is critical in the research field of social governance that a methodological transformation to causality analysis on the crisis of modern society is needed. This analysis enables people to realize that the source of the crisis of modern society is the collective consciousness based on the knowledge of the social contract theory, and that the renewing of the collective consciousness is based on the modern new contractual spirit. This is not only the logical end of the crisis of modern society, but also the logical start of the realization of the goal of modern social governance.